Natural gas hydrate, as a new type energy, 90% of them exists in the Marine environment. While Submarine sandstone hydrate, as one of the many hydrate types, has the highest reserves and the best quality. Therefore it has the most development value. This paper introduced and analyzed the influencing factors and reserves prediction of seabed sandstone hydrate formation. In terms of influencing factors, the effects of seabed sandstone particle size, seabed sandstone interface characteristics, salt concentration and gas composition on sandstone hydrate formation were discussed and also analyzed the reasons for its impact. In terms of reserves prediction, the research on exploration field and numerical analysis is summarized, and it pointed out the most suitable solution for predicting the sandstone hydrate reserves. In addition, the research directions in future on hydrate reserve prediction are also proposed. Firstly, there is no uniform conclusion on the effect of seafloor sandstone particle size on hydrate. This may be due to the fact that different scholars do not have a uniform division of particle size range. Therefore unified for the influence of seafloor sandstone porosity on hydrate is studied. Secondly, a function of salt concentration in seawater as a function of the submarine sandstone depth needs to be established, so that hydrate reserves can be predicted more accurately.

According to the process feature of different distribution of the hoses in the quantitative of loading system, the mathematical model was built for the calculations of loading time in the quantitative loading system. Furthermore the numerical method for solving the hydraulic calculation of ration loading system and the basic idea was discussed, then the flow rates in collecting pipeline and the hose at a certain liquid level were obtained by using iterative method. The flow of each hose was calculated by applying the procedure of quantitative loading system in VC++6.0 highlevel language, and the loading time was got. The model can be applied to quantitative tank car loading system design, transformation, and operational management which provides theoretical support with calculation, analysis, optimization and operation management, etc., of the quantitative tank car loading system.

Optimization study on energy utilization of threephase flow in circular gathering pipeline network establish physical model of circular gathering pipeline network and temperature drop model of threephase flow in tube, built with a minimum energy consumption as objective function of the mathematical model, and analysis the relationship between the changes of water content, temperature and pressure and total energy consumption, finally find out the main factors affect the total energy consumption, secondary factors and the minimum factors were temperature, flow rate, pressure, and get the optimal scheme and pipeline total energy consumption. In the actual production process to reduce temperature so that the total energy consumption minimum. 